module.exports = function expressdemo() {
  var express = require('express');
  var app = express();
  
  // http://127.0.0.1:8081/?hel[a]=lisfe&hel[a]=base
  app.get('/', function (req, res) {
     console.log(req.query);
     res.send('Hello World');
  })
   
  var server = app.listen(8081, function () {
   
    var host = server.address().address
    var port = server.address().port
   
    console.log("应用实例，访问地址为 http://%s:%s", host, port)
  })
}